Estimates specify parts by category, and the categories matter more on some components than others. Knowing the difference lets you spend your attention where it counts.
The four categories
OEM parts come from the vehicle manufacturer, in their box. Aftermarket parts are made by other manufacturers to fit the same vehicle, and quality ranges from excellent to poor. Recycled parts are original components taken from another vehicle. Remanufactured parts are used components rebuilt to a standard.
Where the category matters most
Anything structural, anything that manages crash energy, and anything connected to a safety system. Bumper reinforcements, crash bars, airbag components and sensor mounts all behave in a specific way in an impact, and that behavior is engineered. A panel that merely covers something is a much lower-stakes decision.
Where it matters least
Non-structural cosmetic parts, particularly on an older vehicle, where a good aftermarket part fits properly and finishes well. A recycled original panel in the right color is often the best of both.
The practical test is fit
A poorly made aftermarket panel costs less and then costs more, because the labor to make it line up eats the saving and the panel gaps never look right. A shop that has fitted a lot of them knows which brands are fine.
What your policy says
Many policies permit alternative parts and some specify original equipment for vehicles under a certain age. Read the endorsement rather than assuming. If you want original equipment and the policy does not cover it, you can usually pay the difference.
Ask for it in writing
The estimate should say which category each part is. If it does not, ask. See also what a collision estimate contains.
A1 Collision NY in Long Island City.
Related: our auto body shop and estimating.